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1811–12 New Madrid earthquakes
The 1811–1812 New Madrid earthquakes were an intense intraplate earthquake series beginning with an initial earthquake of moment magnitude (7.5 -7.9) on December 16, 1811 followed by a moment magnitude 7.4 aftershock on the same day. They remain the most powerful earthquakes to hit the contiguous United States east of the Rocky Mountains in recorded history.〔(U.S. Geological Survey: Largest Earthquakes in the United States )〕〔(Historic Earthquakes New Madrid Earthquakes 1811-1812 ) ''USGS'' 〕〔 They, as well as the seismic zone of their occurrence, were named for the Mississippi River town of New Madrid, then part of the Louisiana Territory, now within Missouri.
There are estimates that the earthquakes were felt strongly over roughly , and moderately across nearly 3 million square kilometers (1 million square miles). The 1906 San Francisco earthquake, by comparison, was felt moderately over roughly .
==The 1811–1812 earthquakes==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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